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The density of a liquid is 1.2 g/mL. The...

The density of a liquid is 1.2 g/mL. There are 35 drops in 2 mL. The number of molecules in one drop is (molar mass of liquid = 70)

A

`((1.2)/(35 ))N_A`

B

`((1 )/(35))^2 N_A`

C

`(1.2 )/((35)^2)N_A`

D

`1.2 N_A`

Text Solution

Verified by Experts

The correct Answer is:
C
70 g ( 1 mole ) of the liquid has ` N_A ` molecules .
` 70 g = (70)/(1.2 ) mL`
`(70)/(1.2 ) mL ` has ` N_A` molecules
2 m L ( or 35 drops ) will have
` (N_A )/(70 ) xx 1.2 xx 2 =( 1.2 N_A)/(35 ) `
then I drop will have `= ( 1.2 N_A )/(35 xx 35 ) = ( 1.2 N_A)/((35)^2)`
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